fix(store): improve error for forbidden characters in createActionGroup

[markostanimirovic]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

[netlify]

✅ Deploy Preview for ngrx-io canceled.

Built without sensitive environment variables

Name	Link
🔨 Latest commit	9a27a5b
🔍 Latest deploy log	https://app.netlify.com/sites/ngrx-io/deploys/62d691f3b9912400083a7b2e

[timdeschryver]

Would it be possible to only show the forbidden characters that are used? 🤯

[markostanimirovic]

Would it be possible to only show the forbidden characters that are used? 🤯

Yes, it should be possible. But I think it would be better to show the entire list at once, so the user is immediately aware of all forbidden characters 👀